Smoke Detector Light Shielding and Gas Flow Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fire detectors face challenges in ensuring reliable gas inflow due to labyrinth structures, which can lead to degraded internal pressure and reduced smoke detection efficiency.
Innovation Solution
The detector design includes a light shielding space with specific inflow/outflow openings and guiding mechanisms that accelerate and direct gas flow into the detection space, enhancing the inflow characteristic and ensuring reliable detection of smoke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a labyrinth is provided in the smoke detection unit to shield the inside from light, then light shielding performance is improved, but internal pressure becomes relatively high and gas inflow characteristic is degraded
Solution Approach 1:
The smoke detection unit is divided into multiple chambers (first chamber, second chamber, third chamber) with separate light shielding structures. Each chamber can be independently optimized for both light shielding and gas flow characteristics, resolving the contradiction between light shielding performance and gas inflow characteristic by distributing the light shielding function across multiple segmented sections rather than a single labyrinth structure.
Solution Approach 2:
The light shielding function is extracted from the traditional labyrinth structure and implemented through dedicated light shielding walls and partitions within the chambers. This allows the gas flow path to be optimized separately from the light shielding requirement, enabling both good light shielding performance and maintained gas inflow characteristic.
2Object-affected harmful factors
If the internal pressure of the smoke detection unit becomes high, then light shielding is improved, but smoke detection reliability is degraded due to poor gas inflow
Solution Approach 1:
Different regions of the smoke detection unit have different structural characteristics optimized for their specific functions. The light shielding walls provide dense local structures for light blocking, while the chamber connections and openings provide localized pathways for gas flow. This local differentiation allows simultaneous achievement of light shielding and smoke detection reliability.
Solution Approach 2:
The chamber partitions and connecting structures act as intermediaries between the light shielding requirement and the gas flow requirement. These intermediate structures are designed to block light effectively while maintaining adequate pathways for smoke-containing gas to flow into the detection chambers, thus mediating between the two conflicting requirements.
Data Source
AI summary
Provided is a detector 100 attached to an installation surface 900 of a ceiling, the detector 100 having an attachment surface 11 facing the installation surface 900, in which the detector 100 includes a light shielding space 3 into which smoke flows, a light emitting unit 61 and a light receiving unit 62 that detects smoke flowing into the light shielding space 3, an outer cover 2 that accommodates the light emitting unit 61, the light receiving unit 62, and the light shielding space 3, an outer cover-side inner side inflow/outflow opening 212 and an outer cover-side outer side inflow/outflow opening 213 that allow gas containing smoke to flow into and flow out of the light shielding space 3, the outer cover-side inner side inflow/outflow opening 212 and the outer cover-side outer side inflow/outflow opening 213 being provided toward an opposite side from the attachment surface 11 in the outer cover 2 with reference to a direction substantially orthogonal to the attachment surface 11, and a main body-side inclination portion 211 and a guide portion-side inclination portion 221 that guide gas so that gas flows into the light shielding space 3 through the outer cover-side inner side inflow/outflow opening 212 and the outer cover-side outer side inflow/outflow opening 213.